[Adger Smith]

You only need a small cup of fuel. The pump inlet should be lower than the tank for normal head pressure. Those pumps don't make good suction pumps, but great pressure pumps. Put a T just south of the pump inlet and bring a line forward through the grill area. You should be able to drain, by gravity, enough from the pump and inlet lines to fill the sample cup. Or you might have to go north of the pump and drain the fuel that is above the pump in the feed lines to the carb. Whatever works... that is what I mean by creative plumbing.